Safety-valve for pneumatic tires.



A B. BURKETT. SAFETY VALVE FOR PNEUMATIG TIRES.

APPLICATION FILED JAN.18, 1911.

Patented Oct. 3, 1911.

BRUCE BURKETT,- 0F BURKETT, TEXAS.

SAFETY-VALVE FOR PNEUMATIC TIRES.

Speceation of Letters Patent.

atented Get. 3, 1911.

Application filed January 18, 1911. Serial No. 603,326.

To all whom it may concern:

Be it known that I, BRUCE BURKETT, a citizen of the United States ofAmerica, residing at Burkett, in the county of Coleman and State ofTexas, have invented new and useful Improvements in Safety-Valves for.Pneumatic rfires, of which the following is a specification. Y

This invention relates to safety valves for pneumatic tires or the like,and has for an object to provide a valve which will prevent explosion ofthe tire from excessive air pressure.V

A still. further obj ect of the invention is to provide. a valvestructure which can be con veniently applied to any well known form ofpneumatic tire in lieu of the present check valve.

In the drawing, forming a portion of this specification and in whichlike `numerals of reference indicate similar parts in the several viewsr--Figure 1 is a vertical .section through my improved valve showing thesame applied to aportion of an automobile tire. Fig.- 2 is a sectiontaken on the line 2-2 of Fig. 1.

My improved valve comprises a casing 1 which is preferably provided withan inner reduced portion 3 adapted to be extended through the passage ein the tire 5. The portion 3 is exteriorly threaded and it has mountedthereon the clamping nut (5 which is designed to be adjusted on theportion 3 so as to cause thetre to be securely clamped between the nutand the shoulder 7 of the casing. rl`he opposite end of the casing isprovided with an interiorly threaded portion 8 which receives theexteriorly threaded plug portion i) of the winged adjusting nut 10.

The nut 10 is provided with a longitudinal passage 11 in which isslidably fitted a hollow'valve stem 12. The stem 12 is in? teriorlythreaded at itsinner end, as at 13,

and it has removably itted thereto a cap 18..

The valve 15 is held yielding against the seat 17 by means of4 arelatively strong heli-A 'cal extensile lspring V19 vihic'hfisinterposed The valve 15 is provided preferably,

between the plug portion 9 of the nut and the valve 15, as shown.

Theportion 14 of the valve 15 is provided with a spider 20 in which thestem 21 of an inwardly opening valve 22 is slidably mounted. The outerend of this stem `is threaded, at 23, and it has adjust-ably fittedthereto a nut 24. A relatively light extensile spring 25 is interposedbetween the nut 24 and the spider 20 and it operates to hold' the flaredface of the valve 22 against the walls of the seat 26. The seat 2G isconstructed by forming a continuous flared pas` sage throughout thevalve 15. p

Outwardly of the valve seat 17, the casing l is provided with escapepassages 27. The main body portion of the casing 1 is of a diameterslightly in excess of the diameter. of the valve 15 so that when thelatter' is moved away from the seat 17 the flared face of the valve willbe spacedvfrom the walls of the casing so as to permit of the desireddischarge of the air.

On inliating the tire the cap 18 is removed and the usual air pump isapplied to the outer end of the stem 12, it being understood that thevalve 22 will open under pressure of the incoming air created by thepump and will close on outward pressure of the air within the tire. Onexcessive pres sure of air in the tire the valve 15. will be lifted fromits seat and the air will be permitted to escape by way of the passages27. The nut 24 on the stem of the valve 22 can be adjusted so as toobtain any desired tension on the spring 25. The nut 10 can becorrespondingly adjusted to obtain any dcsired pressure on the spring19.

From the construction of the valve 15 it will be seen that it can bcconveniently engaged with or detached from the stem 12 so as to permitthe same to be ground. The construction is such that on removal of thevalve 15 the valve 22 will be carried therewith and it vmay also ground.

I claim In a valve structure of the class described., a easing, a valveseat therein at one end, an adjustablemember engaged with the casingatthe opposite end, a hollow stem extending throughthe casing andmovable in the adjustable `member and having an outer'portion extendingbeyond the adjustable member, a cap removably engaged with the outer bereadily exposed and y Aportion of the stennthe inner portionof' the anut adjustable on the second stem, and a 15 spring interposed betweenthe spider and the nut and perating to hold the second valve normallyclosed against the seat in the first valve, the said easing having aportion immediately adjacent the valve seat of a diameter greater thanthe diameter of the first valve and formed with a passage.

In testimony whereof I aflix my signature in preseneefof two witnesses.

BRUCE BURKETT Witnesses:

S'ricrnEN HommNs, E. L. HARRIS.

